# How do I use the formula editor?

## If you need to add mathematical expressions in your question and aren't sure how, read this guide.

TestGorilla's formula editor uses LaTeX input. The good news is you don't need to know LaTeX to create beautiful mathematical expressions. We simplify the process for you!

In the question editor, click the formula icon in the rich text editing bar (highlighted in red in the picture below).

This opens the formula editor (as shown below):

Here you can enter your mathematical expression. For example, typing...

e=mc^2

... results in the following:

To simplify your formula editing, we've added a few commonly used mathematical expressions. Simply click on one to use it in your formula.

For other expressions, you must use LaTeX codes. The following table should cover most of your needs. It's a good idea to bookmark this page so you can refer back to it as needed.

 Description Command Output plus or minus \pm multiplication (times) \times multiplication (dot) \cdot division symbol \div simple text \text{text} infinity \infty dots 1,2,3,\ldots dots 1+2+3+\cdots fraction \frac{a}{b} square root \sqrt{x} nth root \sqrt[n]{x} exponentiation a^b subscript a_b absolute value |x| natural log \ln(x) logarithms \log_{a}b exponential function e^x=\exp(x) deg \deg(f) degree \degree circle plus \oplus circle times \otimes not equal \ne less than or equal to \le greater than or equal to \ge approximately equal to \approx vector (arrow) \vec{v} derivative vector \dot{\vec{v}} vector (bold) \mathbf{v} unit vector (hat) \hat{k’} norm ||\vec{v}|| element of \in subset of \subset subset of \subseteq contains \supset contains \supseteq union \cup intersection \cap big union \bigcup_{n=1}^{10}A_n big intersection \bigcap_{n=1}^{10}A_n empty set \emptyset power set \wp{S} minimum \min maximum \max closure \overline{A} derivative \frac{df}{dx} derivative \f' partial derivative \frac{\partial f}{\partial x} limits \lim_{x\to \infty} summation \sum_{n=1}^{\infty}a_n product \prod_{n=1}^{\infty}a_n integral \int_{a}^{b} double integral \iint triple integral \iiint

If you need more symbols, you can look them up in this pdf document (there are 14,283 of them in total). Please note that not all of those symbols are available in our editor. If you're missing something, please contact us here.